[wb-1797-cell-color-contrast] docs(changeset): DetailCell and Compact…

…Cell: update styling to address color contrast accessibility issues

.changeset/wise-actors-peel.md

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+"@khanacademy/wonder-blocks-cell": patch
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+
+DetailCell and CompactCell: update styling to address color contrast accessibility issues. Updated styles include:
+
+- General:
+  - Changing the grey used for subtitles
+  - Using `icon.primary` for the right accessory
+- Press state:
+  - Changing the background to `fadedBlue8`
+  - Adding a thin left border when clickable cells are pressed
+- Hover state:
+  - Changing the background to `fadedBlue8`
+- Disabled state:
+  - Changing the focus outline to `action.disabled.default`
+- Selected state (cells with `active=true`):
+  - Adding a thick left border
+  - Changing the text color to `action.primary.active`
+  - The styling no longer changes when a selected cell is hovered or pressed on